Year 2 - Maths
Add and subtract multiples of ten
Composition of multiples of 10
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit pupils will represent multiples of ten using numerals and names and use knowledge of facts and unitising to add and subtract multiples of ten.
Lesson Summary
You will learn to add and subtract multiples of ten.
Key Notes
- Unitising and known facts help you to add and subtract multiples of ten.
- If 3 + 2 is equal to 5 then 3 tens + 2 tens is equal to 5 tens which is equal to 50
- If 5 - 2 is equal to 3 then 5 tens subtract 2 tens is equal to 3 tens which is equal to 30
Vocabulary To Learn
- Add: To find the total, or sum, by combining two or more parts (addends), or to increase an amount by adding another.
- Subtract: To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.
- Multiple of ten: A multiple of 10 is a number which can be made of groups of ten.
Common Mistakes To Avoid
- Children may not see the link between adding or subtracting ones and adding or subtracting tens. They may not know how to use known facts to help work out equations using multiples of ten.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Unitising and known facts help you to add and subtract multiples of ten. If 3 + 2 is equal to 5 then 3 tens + 2 tens is equal to 5 tens which is equal to 50.
2. Use this key word in a maths sentence and explain it clearly. 'Add'
To find the total, or sum, by combining two or more parts (addends), or to increase an amount by adding another. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Children may not see the link between adding or subtracting ones and adding or subtracting tens. They may not know how to use known facts to help work out equations using multiples of ten. Correction: Reinforce understanding of unitising by describing groups of objects in ones or tens. Make the link between known facts and equations using multiples of ten explicit. Show it with equipment such as base ten blocks and represent on place value charts.
More Lessons In This Unit
- Estimate the position of multiples of ten on a 0 - 100 number line Study Guide
- Explain that one ten is equivalent to ten ones Study Guide
- Explain what happens when you add and subtract ten to a multiple of ten Study Guide
- Represent multiples of ten in an expression or an equation Study Guide
- Represent multiples of ten using their numerals Study Guide
- Represent multiples of ten using their numerals and names Study Guide
- Solve problems involving multiples of ten Study Guide
- Solve problems involving multiples of ten in a range of contexts Study Guide
- Use knowledge of facts and unitising to add and subtract multiples of ten Study Guide
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